How to block pictures on an iphone to conserve data?

I have limited data on my plan and I'm trying to figure out how to not waste it. I don't really need to see pictures on websites

You mean web content of the a site's page? I don't think you can block everything entirely but you can restrict and constrict certain page add-in functions and features. Java Script most likely. See the link Best luck.
http://www.dummies.com/how-to/content/how-to-specify-safari-settings-on-your-iphone.html

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